• Madoc
  • Madoc Dairy
• Maple
  • Maple Creamery
• Marathon
  • Palm Dairies Ltd.
• Marmora
  • Neal's Dairy
• Mattawa
  • Mattawan Dairy
• Maxville
  • McKillican Dairy
• Meaford
  • Hill's Dairy
  • Rowes Dairy & Creamery
• Merrickville
  • Clear Spring Dairy
• Midland
  • Armstong's Dairy
  • Jones Farm Dairy
  • Midland Dairies Ltd.
• Mildmay
  • Lyndale Dairy
• Milford Bay
  • Brooklands Dairy
• Milton
  • Milton Dairy
  • Park Farm Dairy
• Milverton
  • Milverton Creamery
• Mindemoya
  • Wagg's Ltd.
• Mitchell
  • Mitchell Creamery
  • Royston Dairy
  • Stacey Bros. Ltd.
  • Willow Grove Creamery
• Morrisburg
  • Duvals Dairy
  • Morrisburg Dairy
• Mount Albert
  • Price's Dairy
• Mount Brydges
  • Mount Brydges Dairy
• Mount Dennis
  • Rockcliffe Dairy
• Mount Forest
  • Sanlac Dairy
• Murillo
  • Fenton Bros. Dairy